The fact that it is made of brick will not require it to have planning permission (unless you're in a conservation area when things get complicated - but you're not). Other than that I think you it needs to be separated from the main dwelling, usually by 5 metres, not sure what the rule is in small gardens and it must be used for purposes ancillary to the main dwelling eg. storage, gym, summer houses. Because the test is one of use, it is easy for the rule to be abused by those wanting to put b*ds in sh*ds as it's hard to prove the building is not being used for a legitimate purpose. You've probably looked at the link below already.http://www.planningni.gov.uk/index/advice/advice_apply/advice_apply_homes/advice_around_home/advice_home_structures.htmYou should still get a Development Certificate from the council in any case.http://www.ealing.gov.uk/info/200342/planning_permission/659/development_certificateBest to pop down to Perceval House and have a chat with the duty planning officer.
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